A sample of the student's conceptions that math lesson plan 3-Science-semester 2-year women's College affiliated with the Education Bureau of the 2557 (2014) Ang districts 3, 5 County secondary school total number of 120 people who had come from a random sample of the groups (Cluster sampling) by dividing into groups, the experimental group 1 group. The number of 40 people in a group that controls the number of groups 2 and 3 Group of 40 people, a group that is used to find out the effectiveness of the lesson. The number of 40 people.
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